// 封装购物车模块
import { defineStore } from "pinia";
import { ref, computed } from "vue";
import { useUserStore } from "./userStore";
import { insertCartAPI, findNewCartListAPI, delCartAPI } from "@/apis/cart";
export const useCartStore = defineStore(
  "cart",
  () => {
    const userStore = useUserStore();
    const isLogin = computed(() => userStore.userInfo.token);
    //1.定义state - cartList
    const cartList = ref([]);
    //2.定义action - addCart
    const addCart = async (goods) => {
      const { skuId, count } = goods;
      if (isLogin.value) {
        // 登录之后的加入购物车逻辑
        await insertCartAPI({ skuId, count });
        updateNewList();
      } else {
        //添加购物车操作
        //添加过的 - count+1
        //没有添加过 - 直接push
        //思路：通过匹配传递过来的商品对象中的skuId能不能在cartList中找到，找到了就是添加过
        const item = cartList.value.find((item) => goods.skuId === item.skuId);
        if (item) {
          //找到了
          item.count += goods.count;
        } else {
          //没找到
          cartList.value.push(goods);
        }
      }
    };

    //删除购物车
    const delCart = async (skuId) => {
      if (isLogin.value) {
        await delCartAPI([skuId]);
        updateNewList();
      } else {
        //思路
        //1. 找到要删除项的下标值 - splice
        //2. 使用数组的过滤方法 - filter
        const idx = cartList.value.findIndex((item) => skuId === item.skuId);
        cartList.value.splice(idx, 1);
      }
    };

    //获取最新购物车列表
    const updateNewList = async () => {
      const res = await findNewCartListAPI();
      cartList.value = res.result;
    };

    //清空购物车
    const clearCart = () => {
      cartList.value = [];
    };

    //计算属性
    // 1. 总的数量 所有项的count之和
    const allCount = computed(() => cartList.value.reduce((a, c) => a + c.count, 0));
    // 2. 总价 所有项的count*price之和
    const allPrice = computed(() => cartList.value.reduce((a, c) => a + c.count * c.price, 0));

    // 单选功能
    const singleCheck = (skuId, selected) => {
      const item = cartList.value.find((item) => item.skuId === skuId);
      item.selected = selected;
    };

    //是否全选
    const isAll = computed(() => cartList.value.every((item) => item.selected));

    //全选功能
    const allCheck = (selected) => {
      cartList.value.forEach((item) => (item.selected = selected));
    };

    //已选择数量
    const selectCount = computed(() =>
      cartList.value.filter((item) => item.selected).reduce((a, c) => a + c.count, 0)
    );
    //已选择商品价钱合计

    const selectPrice = computed(() =>
      cartList.value.filter((item) => item.selected).reduce((a, c) => a + c.count * c.price, 0)
    );
    return {
      cartList,
      allCount,
      allPrice,
      isAll,
      selectCount,
      selectPrice,
      addCart,
      delCart,
      singleCheck,
      allCheck,
      clearCart,
      updateNewList,
    };
  },
  {
    persist: true,
  }
);
